 Everything. So what are we doing? What are you doing to counteract that? We've lost half our testosterone in 50 years. We can't survive that. I take a male vitality stack from chalk every day to make sure I will never have a problem. Ever. I've been taking it for two years. I am so full of pep and energy and focus. My mood is so much better than it was a few years ago. And it's natural.